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` 1. F. HARRIS.

MOLD.

APPLICATION FILED OCT. 30, i918.

Patented July v22, 1919.

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.HE coLuMnlA PLANOGRAPH un.. WASHINGTON. D. c.

iran sTATEs PATENT ourrca.

JOI-IN F. HARRIS, OF'WILMINGTON, NORTH CAROLINA, ASSIGNOR TO CEMENTPRODUCTS COMPANY,OF WILMINGTON, NORTH CAROLINA, A CORPORATION OF NORTHCARO- LINA.

MOLD.

rSpecfcation of Letters Patent.

Patented July 22, 1919.

Application filed October 30, 1918. Serial No. 260,342.

To all whom t may concern.'

Be it known that I, JOHN F. HARRIS, a citizen of the United States,residing at Wilmington, in the county of New Hanover and State of NorthCarolina, have invented certain new and useful' Improvements in Molds;and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as lwill enable others skilled in theart to which it appertains to make and usethe same.

This invention relates to improvements in molds especially adapted formaking or forming effluent and sludge tanks for sewage systems and hasfor one of its objects the provision of a device of this characterwhereby the device can be readily assembled and later disassembled afterthe plastic material or cement has setwithout the liability of injuringthe molded article, and also whereby the core or shell can be removedfirst from the article.

Another object of this invention is the provision of a mold of the abovestated eharacter, which shall be simple, durable and efficient, andwhich may be manufactured and soldY ata comparatively low cost.

With these and other objects inY view as will becomemore apparent as thedescription proceeds, lthe invention consists in certain novel featuresof construction, combination, and arrangement of parts as will behereinafter more fully described and claimed.

For a complete 'understanding `of my invention, reference is tobe had tothe following description, and accompanying drawings, in which Y Figure1 is a vertical sectional view of a mold constructed in accordance withmy invention,

Fig. 2 is a vertical sectional view of the shell,

3 is a fragmentary plan View of the same, and

Fig. 4 is a plan view of the core.

Referring in detail to the drawings, the numeral -1 indicates the shellwhile the numeral 2 indicates the core. The shell 1 consists of a pairof semi-circular sections 8, which sections are each constructed of aplurality of vertical disposed and relatively spaced beams or members 1provided with notches to receive semiscircular and horizontally disposedmembers 5 having their edges flush with the outer faces of the beams ormembers t by having notches formed therein adapted to interlock orreceive the notches of the members or beams l. A lining 6 constructed ofmetal, wood or other material suitable for the purpose is secured to theinner faces of the members t and 5. The end members or beams 4: of eachof the sections are provided with upwardly and outwardly directed slots7 which open outwardly through the outer faces of said members or beamsat to receive attaching bolts 8. The bolts 8 are adapted to extendthrough the adjacent end members of the sections for securing thesections 3 of the shell 1 together. Spacing blocksv 9 are provided withslots similar to the slots 7 to receive the bolts 8 and are positionedbetween the adjacent end members or beams 4: of the sections 3 forspacing the ends of the sections apart, and which blocks provide spaceswhen removed to permit an instrument to be inserted between the shelland the molded article for prying the shell away from the article.

The core 2 consists of pairs of sections 10 and 11 and the sections 10correspond in size and shape while the sections 11 correspond in sizeand shape. Each of the sections 10 and 11 are identical in constructionexcept for the size and shape thereof, and each consists of a pluralityof vertically disposed members or beams 12 provided with notches toreceive notches formed within horizontally disposed and relativelyspaced horizontal members 13. The faces of the members 13 are flush withthe faces of the members 12 and which members have secured to theirouter faces a lining 11 constructed of metal, wood, or other materialsuitable for the purpose. The end members or beams 12 of each of thesections are provided with upwardly and inwardly directed slots 15 thatopen outwardly through the inner faces thereof to receive bolts 16provided with nuts, whereby the sections l0 and l1 are 4detachablysecured together and are adaptedto be arranged within the shell 1 inspaced relation thereto to form a cement receiving space 17. The members13 of each of the sections 10 and 11 are provided with V positioned onthe top of the core 2 after the terial within the space 17, the shelland core.

are placed upon a hard surface and the space 17 is filled with thecement .or plastic material as well as the plate 1S is covered with thesameto form the bottom of a cylindrical tank. Blocks 19 are secured tothe inner faces of the lining 11 of the core 2 and engage the inner faceof the lining G of the shell 1 l'or the purpose of forming openings inthe tank 1 adjacent its uppei` end. The tank is molded with the bottomupward. Arcuate shaped strips 20 are secured to the lower edge of thecore forforming a rabbeted oint for the upper edge of the tank.

From the foregoing description taken in connection with the accompanyingdrawings, it will be noted that a shell and core has been provided whichcan be readily and conveniently assembled and disassembled and which canbe removed from a molded tank without the danger of injuring the same.It is also to be noted that the device can be disassembled into numerousparts so that the device can be stored in a comparatively small space.

lVhile I have shown and described the preferred embodiment of myinvention, it will be understood that minor changes in construction,combination and arrangement yof parts may be made without departing fromthe spirit and scope of the invention as claimed.

Having thus described my invention, what I claim is 1. A mold comprisingaA shell including semi-circular sections,...said sections havingupwardly and outwardly disposed slots at the ends thereof, boltsextending through said slots for detachably securing the sectionstogether, and a core for said shell.

2. A mold comprising a pair of semi- `circular sections each including aplurality of relatively spaced slots and vertically disposed beams,horizontally disposed arcuate shaped member having notches littingwithin the notches ofv said beams, lining secured to the inner faces ofthe beams and members, the ends of the beamsoi' each section providedVwith upwardly and outlwardly directed notches, bolts extending throughsaid slots for connecting the sections together, and a core for saidshell.

'3. A mold comprising a core including pairs of arcuate shaped sections,the ends of said sections provided with upwardly and inwardly directedslots, bolts disposed within said slots for connecting the sectionstogether, lining secured to the outer faces of said sections, and ashell surrounding said core. Y

t. A mold including a core consisting of a plurality of sections havingvertically disposed and relatively spaced beams provided with notches,arcuate shaped members having notches fitting within the notches of saidbeams, the end beams of each section provided with upwardly `andinwardly directed notches, bolts disposed in said notches for detachably.connecting the sections together, said arcuate shaped members havingstraight inner surfaces to form a rectangular opening withinthe core, alining secured to the-outer acesof the sections, and a shellsurrounding` said core.

5. A mold comprising a. cylindrical shell consisting of a pair ofarcuate shaped sections, means detachably connecting the sectionstogether, a core positioned within said siell, arcuate shapedstripssecured to the outer face of the core adjacentits lower end.-

6. A mold comprising a cylindrical shell having both ends :Eully open, acylindrical core within saidshell and having both ends -fully open,l anda. plate resting-upon the upper end of the core to Jform the `bottom tothe molded article. i

In testimony whereof I aiiiX my in presence of two witnesses.

JOI-INF. HARRIS.

signature lVitnesses l-lUeiifA. Dawson, CLARENCE BALENTINE.

Copies of thispatent may be obtained for ve cents each, by addressngtheCommissioner of Patents, Washington, D. C.

